Eschwartz [1] filed a deletion request for luaposix [2]: We don't need two lua packages for the posix bindings, and the other one seems to be "better", see https://lists.archlinux.org/pipermail/aur- requests/2018-May/024001.html
[1] https://aur.archlinux.org/account/Eschwartz/ [2] https://aur.archlinux.org/pkgbase/luaposix/